[hibernate-issues] [JIRA] (HHH-16571) Avoid root table join for FK access of key-many-to-one

Christian Beikov ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiYTMyM2Y4NGVl... ) / Improvement ( https://hibernate.atlassian.net/browse/HHH-16571?atlOrigin=eyJpIjoiYTMyM2... ) HHH-16571 ( https://hibernate.atlassian.net/browse/HHH-16571?atlOrigin=eyJpIjoiYTMyM2... ) Avoid root table join for FK access of key-many-to-one ( https://hibernate.atlassian.net/browse/HHH-16571?atlOrigin=eyJpIjoiYTMyM2... ) Change By: Christian Beikov ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) An entity model with a key-many-to-one that uses joined inheritance always has to join the root table when querying a subclass, even if no attributes of the super types are used. This is unfortunately because the FK of the {{ToOneAttributeMapping}} uses the root table information for the mapping. We should try to optimize this in {{org.hibernate.metamodel.mapping.internal.MappingModelCreationHelper#interpretToOneKeyDescriptor}} to be able to avoid always joining. Note that there is code which build builds on the current behavior, but I added a TODO comment with this Jira key along with explanation of what needs to be done. ( https://hibernate.atlassian.net/browse/HHH-16571#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16571#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100225- sha1:bbd69a1 )